Open the Phone app
Go to Recents or Call History
Tap Edit or More
Select the calls you want to delete
Tap Delete or Clear
Confirm the deletion
To clear all calls, choose Clear All if available
On Android, open Phone app, tap Recents, then tap the trash icon or Clear call log
On iPhone, open Phone app, tap Recents, tap Edit, then Clear, then Clear All Recents
If needed, clear call history from your carrier account or call log settings